SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

SSL/TLS Certificate for kf-lex.pl

Expiring soon
Issued by (CA)
Asseco Data Systems S.A.
Subject
kf-lex.pl
Valid from
May 12, 2026
Valid until
Nov 27, 2026 (19 days remaining)
Public key
RSA 4096-bit
Serial
7DE50735CF2616127773A4D411EDC522
SHA-256 fingerprint
65:72:E4:1E:92:0B:D4:F5:BE:47:CA:0E:E7:C7:8A:A6:13:DE:CA:6E:7D:57:D5:AB:BB:AF:E2:B4:C2:A4:A0:09
Chain
Certum DV TLS G2 R39 CA → Certum Trusted Root CA
Subject Alternative Names (2)
kf-lex.pl, www.kf-lex.pl

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

This certificate has been served since Oct 27, 2026.

Never get surprised by kf-lex.pl's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch kf-lex.pl continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

Uptime

We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.

DNS changes

We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.

TLS certificate

We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.